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Allows the user to interact with physical objects above the table. There are two types: Electromagnetic TUI: It uses electromagnetic arrays that installed under the table surface to control the tangibles. It can be controlled by the user and the software. Naturel User Interfaces (NUI) Tangible Tabletop Interface Example of Pico [3]

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motorized TUI: It uses motorized tangibles that moves on the table surface. There are two types: Active tangibles: allow the user to interact with the tangibles without touching them Passive tangibles: the interaction done through direct touching. Naturel User Interfaces (NUI) Tangible Tabletop Interface Bidirectional version of mixiTUI that uses active tangibles [4]

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It can be divided to three types: Single-user manipulation, which required only two points of contacts. Single-user gesture, which required a small number of points of contacts. Multi-user gesture, which required a large number of points of contacts. Naturel User Interfaces (NUI) Touch Gesture Interface Google image

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Questions

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Activity You are going to develop In Air gesture interface to manipulate different functions that control your desktop, come up with different interactions technique to perform the following functions: Open a file Put two files in a new folder Move a file to an existing folder Create new folder Sort icons on desktop